Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc54447b22037e5…

MALICIOUS

PDF

86.6 KB Created: 2021-07-04 20:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a0f1fad663277d492d04fb0b8fd967ae SHA-1: 419b75860362fd0c719e850cb65e6a0a1606ff29 SHA-256: 4bc54447b22037e5d5813af201417d373be010ed6b563aa62473b5f1612f53bd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing or malware distribution lure, as indicated by multiple heuristics flagging it as a link farm on compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded URLs likely lead to further stages of infection or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://queure.ru/uplcv?utm_term=cash+out+sweepstakes PDF link annotation
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/e1e052jd1434l3vg2vlir4oob0/rusigerigalup.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082aa335f1c9---42700071913.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/9tfbo7dgr1ghb7p0sjcurn1bh6/nileg.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/2efa6102918fac2e2f2bf708577747ce/vijuzuginabidujevaxotoxe.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/4c44fe67cb78b76feb2ae650d990d2a1/remipopexakixovawogeliz.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/porotedusovak.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/54012f380c0e29e5d14c9fa798ea5bf2/13646563258.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/fipifupukexujeliwigivurom.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/7288c410b3d872c7a0fda5af0c6af5cb/wunadituvelebed.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0900d4548---67861731633.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/vakuru.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4b47a9172---godepokuvifusamep.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/44204592.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/16123848770.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/693be700c065ee5af00d582b50c918b2/lamudenela.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/0sam0i4gb0t6a5u022pit82t66/47839928264.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1d205687597e6d0d2664d7cd88bbb3c2/dadalot.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47d0d66694---vutufumezopi.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/qsbqkkig4d617122b7iuru4cfd/fomazigimukerumewufutefu.pdfIn PDF document text
    • https://capecoralliving.com/media/file/60234893671.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d38dc605728---4083123970.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/3194770377.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/7d6f3d1fc1d336eefd04318c2f347125/gikagowamokosezug.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF069 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001087b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087B 17212 bytes
SHA-256: 84ab6724e36c3e684b6cdc56552eeca33c6f596fc7d9391c7ee54b93dbfeb538
font_02_sfnt_off00013592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13592 10316 bytes
SHA-256: bf5ab55f7a954e6327b40fb7ed9b7c04b4c0e41005f8fb0af57f19eb0bcc2b3f

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